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ATrem.1
ATrem.1
Associate II
February 3, 2020
Solved

Package UFQFPN32 (5x5 mm) for STM32F302x6 STM32F302x8

  • February 3, 2020
  • 7 replies
  • 4715 views

Hi,

The package UFQFPN32 (5x5 mm) have an exposed pad but where is the definition of this Exposed Pad in the datasheet for the STM32F302K8 K Must I connect to the GND or is it not connected or maybe another pin definition ? I can't see in the datasheet.

Thanks for your help.

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Best answer by Amel NASRI

Hello @ATrem.1​  and @Community member​ ,

Indeed the note to be added is the following: "“There is an exposed die pad on the underside of the UFQFPN package. It is recommended to connect and solder this back-side pad to PCB ground".

We need to wait for new document release to add it.

Thanks,

Amel

7 replies

waclawek.jan
waclawek.jan
Super User
February 3, 2020

This is a recurring question, see e.g. https://community.st.com/s/question/0D50X00009XkZOtSAN/stm32f301k8u6-connection-of-exposed-pad , https://community.st.com/s/question/0D50X00009XkWZWSA3/stm32f301kxux-exposed-pad-of-ufqfpn-package-connection , https://community.st.com/s/question/0D50X00009XkX5mSAF/stm32l071kbux-ufqfpn32-exposed-pad .

I can't find the mentioned remark in DocID025147 rev.7 (STM32F302x6 STM32F302x8 DS) nor in DS9895 Rev 8 (STM32F301x6 STM32F301x8).

@Amel NASRI​  , could this please be resolved, possibly for all the relevant DS with packages which have exposed pad?

JW

Amel NASRI
Amel NASRIBest answer
ST Technical Moderator
February 17, 2020

Hello @ATrem.1​  and @Community member​ ,

Indeed the note to be added is the following: "“There is an exposed die pad on the underside of the UFQFPN package. It is recommended to connect and solder this back-side pad to PCB ground".

We need to wait for new document release to add it.

Thanks,

Amel

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waclawek.jan
waclawek.jan
Super User
February 17, 2020

Thanks, Amel.

JW

ATrem.1
ATrem.1Author
Associate II
February 17, 2020

Thanks, Amel.

So it's the same for a lot of STM32 references with the same package. The STM32L432KC is in this case ?

Amel NASRI
Amel NASRI
ST Technical Moderator
February 18, 2020

Need to check for STM32L432KC.

To give better visibility on the answered topics, please click on "Best Answer" on the reply which solved your issue or answered your question.
ATrem.1
ATrem.1Author
Associate II
March 13, 2020

For my board, I connected it to the GND and it's working. I hope no problem later...

Amel NASRI
Amel NASRI
ST Technical Moderator
May 6, 2020

Note added for F302 datasheet (https://www.st.com/resource/en/datasheet/stm32f302r6.pdf).

To give better visibility on the answered topics, please click on "Best Answer" on the reply which solved your issue or answered your question.
waclawek.jan
waclawek.jan
Super User
May 6, 2020

Thanks, Amel.

JW

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